NextGen - How to check Average invoices for last 3 years ?

NextGen - How to check Average invoices for last 3 years ?

1) Click on the statistics and reports icon as shown below and click on accounting. 
A > Click on Statistics and reports.
B > Click on Accounting.



2) Click on Average Invoices (last 3 years).



3) You can select the reports for the month accordingly and, you can also > Generate report, Download in CSV, Show graph, Print etc.